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package key
import (
"encoding/hex"
"fmt"
"io"
"os"
)
// LoadPublicKey reads the public key from disc, or generates a new keypair
// if it does not already exist.
func LoadPublicKey() ([32]byte, error) {
// Generate a keypair if it doesn't already exist.
if err := generateIfNoExist(); err != nil {
return [32]byte{}, err
}
// Open key file.
f, err := os.Open(pubKeyFile)
if err != nil {
return [32]byte{}, err
}
defer f.Close()
// Read key.
buf, err := io.ReadAll(f)
if err != nil {
return [32]byte{}, err
}
// Decode.
var key [32]byte
if hex.DecodedLen(len(buf)) != len(key) {
return [32]byte{}, fmt.Errorf("malformed key: expected %d bytes; got %d",
len(key), hex.DecodedLen(len(buf)))
}
if _, err := hex.Decode(key[:], buf); err != nil {
return [32]byte{}, err
}
return key, nil
}
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